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Sennheiser CX 400BT True Wireless Headphones

MSRP 200 USDNEX score 73%

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Product Overview

Sennheiser CX 400BT are high-end true wireless earphones that share many featured debuted with the award-winning MOMENTUM True Wireless 2, including Sennheiser's 7mm dynamic drivers.
The CX 400BT True Wireless are created for an always-connected lifestyle. The 20-hour battery life with 7 hours on a single charge allows the user to wear them wherever they go. For phone calls and when using smart assistants, the earbuds feature ambient noise reduction microphones to make voice interactions sound natural and crystal clear.
With the Sennheiser Smart Control app, it is also possible to tailor the sound experience to one’s personal preference via the built-in equalizer. Support for codecs such as SBC, AAC and aptX assures exceptional sound quality with both iOS and Android mobile devices.

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Ratings

What we found**

Pros
  • Excellent sound quality
  • Comfortable to wear
  • Supports aptX and Bluetooth 5.1
  • Good battery life
Cons
  • Nothing in particular

What external reviewers found***

NEX score: 73% (not directly comparable across industries)
Pros
  • Superb sound quality
  • Excellent control app
  • Decent build quality
  • Excellent detail retrieval
Cons
  • Lacks low-bass
  • No wireless charging
  • No aptX HD
  • No LDAC or aptX-HD support
  • No aptX or Hi-Res Audio compatibility
  • Underwhelming battery life
Read More

Price Comparison (incl. referral links)*

Specifications

Variants:
Charging Case

Connectivity

Ports
USB-C
Wireless Connectivity
Bluetooth 5.1

Construction

Drivers
Sennheiser 7mm dynamic driver
Headphone Type
In-ear, closed

Dimensions

Charging CaseSize | Depth
33.8 mm
Charging CaseSize | Height
42.3 mm
Charging CaseSize | Width
59 mm
Weight
2x 6g (earbud) + 37g (charging case)

Function

Bluetooth Codecs
SBC, AAC, aptX
Bluetooth Profiles
A2DP, AVRCP, HSP, HFP

Performance

Battery Life
7 h with earbuds, 20 h with charging case
Charging Time
1.5 h
Frequency Response
5 Hz - 21 kHz
Microphone Frequency Response
100 Hz - 10 kHz

Production

Availability
2020-09-15
Debut
2020-09-01

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3rd-Party Review Videos

External Reviews

digitaltrends[1]

Sentiment Score 77%
Reviewers from digitaltrends have found the following***:
The Sennheiser CX 400BT offer superb sound for their $200 price. Stereo imaging, precision, depth, and width of the soundstage are all superb. If only they had a few more bells and whistles, we'd be in true wireless earbud heaven.
Find the original article here.
Pros
  • Superb sound quality
  • Comply Foam tips
  • Comfortable fit
Cons
  • Underwhelming battery life
  • No active noise cancellation (ANC)

pcmag[2]

Sentiment Score 87%
Reviewers from pcmag have found the following***:
The Sennheiser CX 400BT are some of the best-sounding true wireless in-ears we've tested. The earphones are compatible with Bluetooth 5.1, and support AAC, AptX, and SBC codecs. On tracks with intense sub-bass content, the earphones deliver powerful low-frequency response. The mic offers solid intelligibility.
Find the original article here.
Pros
  • Powerful, natural sound signature
  • Comfortable fit
  • Supports AAC, AptX, and SBC codecs
Cons
  • Noise cancellation isn’t adjustable

rtings[3]

Sentiment Score 32%
Reviewers from rtings have found the following***:
The Sennheiser CX 400BT are alright for mixed use. They're fairly comfortable and are stable enough for moderate exercise. They can reduce quite a bit of mid-range sounds like ambient chatter. However, they struggle to block out bass-range noise like bus engines. Their battery life most likely won't be enough to get you through your 9-5.
Find the original article here.
Pros
  • Well-built design
  • Comfortable and stable fit
  • Good passive noise isolation performance
  • Great battery life
Cons
  • Bass-heavy soundstage
  • No stability fins
  • Lacks low-bass

t3[4]

Sentiment Score 78%
Reviewers from t3 have found the following***:
The Sennheiser CX400BT are among the most capable all-rounders this sort of money can buy. Wireless connectivity is via Bluetooth 5.1, and there's support for SBC, AAC and aptX codecs. Voice assistance can be provided by either Siri or Google Assistant.
Find the original article here.
Pros
  • Excellent sound quality
  • Excellent detail retrieval
  • Decent build quality
Cons
  • No aptX HD

techradar[5]

Sentiment Score 84%
Reviewers from techradar have found the following***:
The CX400BT are an articulate and naturalistic listen on the whole, and nowhere is that more apparent than when they're loading voices with character and emotional weight. The bottom end attacks with straight-edged clarity, and the decay of individual notes is well managed at the bottom of the frequency range as a whole. Up in the midrange there's an equally gratifying amount of detail retrieved and laid out for inspection. Seven-in is not the most impressive battery life a true wireless in-ear.
Find the original article here.
Pros
  • Excellent sound quality
  • Excellent control app
  • Excellent battery life
Cons
  • No aptX or Hi-Res Audio compatibility
  • No wireless charging

trustedreviews[6]

Sentiment Score 78%
Reviewers from trustedreviews have found the following***:
The CX 400BT have the same 7mm drivers that feature in the MOMENTUM TW2 (which we bestowed our best true wireless award 2020) Bluetooth 5.1 is the wireless connection and despite the premium sound claims there’s no support for LDAC or aptX-HD. The headphones support Alexa, Google Assistant and Siri (though none are built in) and they’re compatible with the Sennheiser Smart Control app (Android, iOS)
Find the original article here.
Pros
  • High-fidelity stereo sound
  • Intuitive controls
  • Decent battery life
Cons
  • No LDAC or aptX-HD support

whathifi[7]

Sentiment Score 78%
Reviewers from whathifi have found the following***:
Sennheiser CX 400BT wireless earbuds are a great value for money. Sound is lively and clear-cut, and relatively open presentation is infused with clarity and generously peppered with detail. Bass is taut and agile, mids are expressive and particularly open, and a crisp, present treble doesn't let the side down. However, their sparkle comes at the expense of a little refinement.
Find the original article here.
Pros
  • Gorgeous, energetic sound
  • Comfortable fit
  • Excellent battery life
Cons
  • Not for sportswear
  • Touch controls can be hit and miss

User Reviews

References

1. ^ Sennheiser CX 400BT True Wireless review: Great sound, but not much else. [digitaltrends]. https://www.digitaltrends.com/headphone-reviews/sennheiser-cx-400bt-true-wireless-review/. 2020-09-11. Retrieved 2021-03-22.
2. ^ Sennheiser CX 400BT Review. [pcmag]. https://www.pcmag.com/reviews/sennheiser-cx-400bt. 2020-10-23. Retrieved 2021-03-22.
3. ^ Sennheiser CX 400BT True Wireless Headphones Review. [rtings]. https://www.rtings.com/headphones/reviews/sennheiser/cx-400bt-true-wireless. 2020-11-25. Retrieved 2021-03-22.
4. ^ Sennheiser CX400BT review: True wireless earbuds that are something of a wolf in sheep’s clothing. [t3]. https://www.t3.com/reviews/sennheiser-cx400bt-review-true-wireless-earbuds-that-are-something-of-a-wolf-in-sheeps-clothing. 2020-09-01. Retrieved 2021-10-20.
5. ^ Sennheiser CX 400BT True Wireless review. [techradar]. https://www.techradar.com/reviews/sennheiser-cx-400bt-true-wireless. 2020-09-04. Retrieved 2021-03-22.
6. ^ Sennheiser CX 400BT Review. [trustedreviews]. https://www.trustedreviews.com/reviews/sennheiser-cx-400bt. Retrieved 2021-03-22.
7. ^ Sennheiser CX 400BT review. [whathifi]. https://www.whathifi.com/reviews/sennheiser-cx-400bt. 2021-02-26. Retrieved 2021-03-22.

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***These key takeaways ("pros" and "cons") and summaries are identified from third-party review by our AI using advanced language models.

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